

Visuals video Īlthough the song was never promoted with an official music video, a conceptual visual video-created by Aguilera and her team-was released on May 11, 2018. Zach Johnson of E! Online labelled "Twice" as a "brooding ballad". Althea Legapsi from Rolling Stone opined that the lyrics contemplate "the duality that can be found with love", and Mike Nied from Idolator deemed the singer's voice, calling it "as strong as ever before". During a review for Liberation for PopCrush, Bobby Olivier called "Twice" "a sparse and pensive track" and described the intro of the song as "harmonic". Neil McCormick from The Daily Telegraph considered that Aguilera sounded "like a one-woman Fleetwood Mac" and praised "her rich low notes fluttering effortlessly up to falsetto with no loss of control". Nicholas Hautman of Us Weekly stated that "Twice" is Aguilera's best song since " Hurt", noting its "contemplative and stripped-down nature". Furthermore, Arnold felt that Aguilera displayed "softer, more subtle shades of her delivery" in order to demonstrate "what a great singer can do when it’s all about the song - and the voice". Jon Pareles from New York Times said that "Twice" "mournfully ponders sin, forgiveness and redemption", while Chuck Arnold from New York Post described the song as a "haunting piano ballad".

According to the sheet music published at by Sony/ATV Music Publishing, the song is performed in the key of F ♯ Minor with a moderately slow tempo of 75 beats per minute.

Musically, "Twice" has been described as a soulful ballad with a length of four minutes and two seconds. The track was released for digital download and streaming as the first promotional single from Liberation on by RCA Records. On May 10, 2018, Aguilera posted a video on her Twitter account in which she teased the release of a song from her then-upcoming eight studio album, Liberation (2018), stating that she loves the song's "raw vocal quality" and the "spiritual emotion and tone" it conveys. "Twice" was solely written by Kirby Lauryen, while co-producing along with Sandy Chila.
